If the application of behavioral techniques does not produce large enough effects for practical value, then the application has failed. Practical value is whatever you define as meaningful for your child's life.
The original poster (OP) wrote, 'My second child is starting high school next year and is hell-bent on joining the marching band. I was in marching band myself when I was in high school and I wasn't against her joining. The discipline would be good for her. Then I found out how much it costs.'
Anger is a core emotion that's pre-wired in the brain. Core emotions tell us what we need and what is good for us. For example, fear (another core emotion) prompts us to seek safety, while sadness tells us there's something to mourn. Anger shows up when we feel violated. This is why feeling wronged, like when our kids repeatedly push back or yell at us, can evoke it.
A Genexa survey of 1,000 U.S. moms found that 70% use their own sick days to stay home when their child is ill, and 58% work from home while caregiving. In other words, many of us are doing the same impossible math: caring for sick kids while trying to keep our work lives moving.